Journal of the Society of Motion Picture Engineers (1930-1949)

Record Details:

Title:
Journal of the Society of Motion Picture Engineers
Date:
1930-1949
Publisher:
New York, N.Y. : The Society
Volume:
Journal of the Society of Motion Picture Engineers
Leaf #:
000573
Language:
English
Collection:
Technical Journals
Format:
Periodicals
Contributor:
Prelinger Library
Sponsor:
MSN
Coordinator:
Media History Digital Library
Description:
The Journal of the Society of Motion Picture Engineers (SMPE)Êdocuments the technological progress of the film industry, highlighting technical developments in production and exhibition. Of special interest are articles about special effects, theater practices, lighting, and the introduction of the 16mm format. Initially titled "Transactions of the Journal of the Society of Motion Picture Engineers."Digitized by the Prelinger Library and the Library of Congress Motion Picture, Broadcasting and Recorded Sound Division.
Date Added:
July 19, 2022
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568 NEW MOTION PICTURE APPARATUS []. s. M. p. E. By very close cooperation with the tube manufacturer, tubes have been obtained for this equipment which under the conditions of operation will have a life of several thousand hours. All the tubes used are specially selected and controlled in production for characteristics important hi this particular application. The standard equivalents of these tubes can be substituted where necessary with a corresponding reduction hi life and lower overall performance. Underwriters' Approval. — All parts of these equipments have been submitted to the Underwriters' Laboratories for test and examination and have been approved. FIG. 20. High-frequency horn-mounting bracket. LOUD SPEAKERS AND OVERALL RESPONSE Loud Speaker Equipment. — The loud speaker complements employed with the PG-140, PG-141, and PG-142 equipments are shown respectively hi Figs. 18 and 19. The larger complement, shown in Fig. 19, is used on both the PG-141 and PG-142 equipments. Distribution. — As can be seen hi Fig. 18, the low-frequency baffle is mounted on its end to permit better low-frequency distribution in the horizontal plane. New HighFrequency Horn-Mounting Bracket. — As a further aid to readily ob taming equal high-frequency distribution hi the theater, a new high-frequency horn-mounting bracket has been designed. This mounting bracket is shown in Fig. 20. It will be noted that this bracket pivots the high-frequency horn about the center layer of cells and is sufficiently close to then mouth that the horn can be angled up or down without seriously changing its phase relationship with